Abstract:A broadband reflector with a reflectance up to 97.8% over a 144 nm spectral range from 1476 to 1620 nm was proposed by comprising double-layer subwavelength gratings with one grating layer embedded in SiO 2 layer. An analysis of the resonance leaky modes with overlapping gratings showed the physical mechanism of the wide broad high-reflectivity band. The structural parameter tolerance was analyzed and the variation of bandwidth was explained by combining the behaviors of the two guided mode resonances. The gui… Show more
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